Near-Infrared and X-Ray Observations of XSS J12270−4859

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  • Kei Saitou
    1Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 ksaitou@astro.isas.jaxa.jp
  • Masahiro Tsujimoto
    1Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 ksaitou@astro.isas.jaxa.jp
  • Ken Ebisawa
    1Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 ksaitou@astro.isas.jaxa.jp
  • Manabu Ishida
    1Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 ksaitou@astro.isas.jaxa.jp
  • Koji Mukai
    3Code 662, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA
  • Takahiro Nagayama
    4Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Nagoya 464-8602
  • Shogo Nishiyama
    5Extra-Solar Planet Detection Project Office, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588
  • Poshak Gandhi
    1Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 ksaitou@astro.isas.jaxa.jp

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<jats:title>Abstract</jats:title> <jats:p>XSS J12270 $-$ 4859 (J12270) is an enigmatic source of unknown nature. Previous studies revealed that the source has unusual X-ray temporal characteristics, including repetitive short-term flares, followed by spectral hardening, non-periodic dips, and dichotomy in activity; i.e., intervals filled with flares and those without. Together with a power-law X-ray spectrum, it is suggested to be a low-mass X-ray binary. In order to better understand the object, we present the results of our near-infrared (NIR) photometry and linear polarimetry observations as well as X-ray spectroscopy observations, which overlap with each other partially in time, taken respectively with the InfraRed Survey Facility (IRSF) and the Rossi X-ray Timing Explorer (RXTE). We detected several simultaneous NIR and X-ray flares for the first time. No significant NIR polarization was obtained. We assembled data taken with IRSF, RXTE, Suzaku, Swift, and other missions in the literature and compared the flare profile and the spectral energy distribution (SED) with some representative high-energy sources. Based on some similarities of the repetitive NIR and X-ray flaring characteristics and the broad SED, we argue that J12270 is reminiscent of microquasars with a synchrotron jet, which is at a very low-luminosity state of $\approx$ 10 $^{-4}$ Eddington luminosity for a stellar mass black hole or neutron star at a reference distance of 1 kpc.</jats:p>

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